"One of the things they need to hear from me is that the Virginia Republican party values religious liberty and we stand with them, and they're part of this community too," he said.

Many attendees of the mosque, which is one of the largest in the D.C. region, said they worry that Trump will ban Muslims from entering the country.

During the campaign, Trump said that if elected he would enact a "total and complete shutdown of Muslims entering the United States until our country's representatives can figure out what the hell is going on."